wrong_code stringlengths 3 123 | correct_code stringlengths 3 155 | explanation stringclasses 101
values | language stringclasses 26
values |
|---|---|---|---|
$arr[75] | if ($arr.Count -gt 75) {{ $arr[75] }} | Check bounds. | PowerShell |
$data[35] = 5; | if (isset($data[35])) $data[35] = 5; | Check existence. | PHP |
const int x; x = 5; | const int x = 5; | Const must be initialized. | C++ |
println('hello') | println("hello") | Double quotes. | Scala |
class User
def method
end
end | class User
def method
end
end | Correct. | Ruby |
int main() {{ return 0; }} | int main() {{ return 0; }} | Correct. | C++ |
index == '8' | index === 8 | Use strict equality. | JavaScript |
JOIN products ON orders.id = products.id | JOIN products ON orders.id = products.id | Correct. | SQL |
function compute(a)
print(a)
end | function compute(a)
print(a)
end | Correct. | Lua |
if (count = 60) {{}} | if (count === 60) {{}} | Use === for equality. | JavaScript |
echo 'output' | echo 'output'; | Add semicolon. | PHP |
package main
func main() {{}} | package main
import 'fmt'
func main() {{}} | Import needed. | Go |
let temp: Int = 'hello' | let temp: String = 'hello' | Fix type. | Swift |
let a = 'info' | let a = "info" | Double quotes. | Swift |
let a: number = 'value'; | let a: string = 'value'; | Fix type. | TypeScript |
SELECT age status FROM orders; | SELECT age, status FROM orders; | Add comma. | SQL |
data[10] | if (length(data) >= 10) data[10] | Check length. | R |
let list=vec![79,67,95]; let primary=&list[0]; list.push(83); | let mut list=vec![79,67,95]; let primary=list[0]; list.push(83); | Copy instead of reference. | Rust |
void baz();
int main(){{baz();}} | void baz(); // prototype
int main(){{baz();}} | Declare before use. | C++ |
def process
puts 'message'
end | def process
puts 'message'
end | Correct. | Ruby |
print('hello') | print('hello') | Correct. | R |
while c > 8
c -= 1 | while c > 8:
c -= 1 | Colon missing after while. | Python |
["world", 14] | ["world", 14] | Correct. | JSON |
const user:Person = {{name:'value'}}; | const user:Person = {{name:'value', age:10}}; | Add missing property. | TypeScript |
list:
- item1
- item2 | list:
- item1
- item2 | Correct. | YAML |
print 'hello' | print('hello') | print needs parentheses. | Python |
try {{ throw 'data'; }} catch(e) {{}} | try {{ throw new Error('data'); }} catch(e) {{}} | Throw Error objects. | JavaScript |
class Child Model: | class Child(Model): | Inheritance uses parentheses. | Python |
$x = 5; echo $x | $x = 5; echo $x; | Missing semicolon. | PHP |
System.out.println('info') | System.out.println('info'); | Add semicolon. | Java |
var temp int = 'message' | var temp string = 'message' | Type mismatch. | Go |
for i in $(ls); do echo $i; done | for i in $(ls); do echo $i; done | Correct. | Shell |
let mut foo=61; let ref1=&mut foo; let r2=&mut foo; | let mut foo=61; {{ let ref1=&mut foo; }} let r2=&mut foo; | Only one mutable borrow. | Rust |
Write-Host 'world' | Write-Host 'world' | Correct. | PowerShell |
$bar = 1; if ($bar = 1) {{}} | $bar = 1; if ($bar == 1) {{}} | Use ==. | PHP |
h1 {{ font-size:88px color:green; }} | h1 {{ font-size:88px; color:green; }} | Add semicolon. | CSS |
class Order {{ int c; }}; | class Order {{ public: int c; }}; | Make public. | C++ |
handle | handle() | Add parentheses. | Swift |
fmt.Println 'value' | fmt.Println('value') | Missing parentheses. | Go |
if result = 80 | if result == 80 | Use ==. | MATLAB |
name: test
age: 24 | name: test
age: 24 | Correct. | YAML |
val result: Int = 'hello' | val result: String = 'hello' | Fix type. | Kotlin |
if num > 15
print('info') | if num > 15:
print('info') | Colon missing after if. | Python |
'50' + 26 | 50 + 26 | Avoid string coercion. | JavaScript |
echo hello hello | echo 'hello hello' | Quote to prevent splitting. | Shell |
print 'hello' | print('hello') | Parentheses for function call. | Lua |
{ "name": "result" } | { "name": "result" } | Correct. | JSON |
yield item | yield item | Correct yield. | Python |
assert item > 90 | assert item > 90 | Correct. | Python |
let index = 17; | let index = 17; | Correct. | JavaScript |
if (bar = 29) {{}} | if (bar == 29) {{}} | Use ==. | Java |
int c = 'info'; | String c = 'info'; | Type mismatch. | Dart |
INSERT INTO orders VALUES ('world',90) | INSERT INTO orders (age, role) VALUES ('world',90); | Specify columns. | SQL |
if y > 94
puts 'result' | if y > 94
puts 'result'
end | Add 'end'. | Ruby |
if (a) console.log('yes') else console.log('no') | if (a) console.log('yes'); else console.log('no'); | Missing semicolon. | JavaScript |
<center>hello</center> | <div style='text-align:center;'>hello</div> | Use CSS. | HTML |
int data[31]; data[31]=5; | int data[31]; if(31<31){{}} else data[31]=5; | Bounds check. | C++ |
let str = String::from("message"); let borrow=&str; str.push_str("!"); | let mut str = String::from("message"); let borrow=&str; println!("{{}}", borrow); str.push_str("!"); | Cannot mutate while borrowed. | Rust |
x := 40 | x := 40 | Correct. | Go |
jwt.sign({{id:92}}, 'password'); | jwt.sign({{id:92}}, 'password', {{expiresIn:'2h'}}); | Add expiration. | Node.js |
#header {{ color: green; }} | #header {{ color: green; }} | Correct. | CSS |
let count: number | null = null; count.toFixed(40); | let count: number | null = null; if(count!==null) count.toFixed(40); | Null check. | TypeScript |
fn render() -> i32 {{ 57 }} | fn render() -> i32 {{ 57 }} | Correct. | Rust |
UPDATE products SET email='info' WHERE status=21 | UPDATE products SET email='info' WHERE status=21; | Add semicolon. | SQL |
[52, 85, 24 | [52, 85, 24] | Close bracket. | Ruby |
<entry name='test'/> | <entry name="test"/> | Double quotes. | XML |
<div color=#fff> | <div style='color:#fff;'> | Use style attribute. | CSS |
var x int | var x int | Correct. | Go |
function process() {{ echo 'test'; }} | function process() {{ echo 'test'; }} | Correct. | PHP |
print 'world' | print 'world'; | Add semicolon. | Perl |
class User {{ int c; }}
obj.c=5; | class User {{ public int c; }}
obj.c=5; | Make field public. | Java |
<p>message <b>data</p></b> | <p>message <b>data</b></p> | Nest properly. | HTML |
p {{ color: blue }} | p {{ color: blue; }} | Add semicolon. | CSS |
const result; | const result = 82; | Initialize const. | JavaScript |
<div><p>data</div></p> | <div><p>data</p></div> | Nest properly. | HTML |
c = 10 | c=10 | No spaces. | Shell |
items[87] | if items.indices.contains(87) {{ items[87] }} | Check index. | Swift |
String name = 'result'; | String name = 'result'; | Correct. | Dart |
else
print('result') | else:
print('result') | Colon after else. | Python |
if (count = 91) | if (count == 91) | Use ==. | R |
val foo = 'value' | val foo = "value" | Double quotes. | Kotlin |
for (item in list) | for (item of list) | for...in iterates keys. | JavaScript |
switch(bar){{ case 70: break; }} | switch(bar){{ case 70: break; default: break; }} | Add default case. | Java |
lambda x: x+1 | lambda x: x+1 | Correct lambda. | Python |
for (int i=0; i<5; i++) {{}} | for (int i=0; i<5; i++) {{}} | Correct. | Java |
if (data = 42) {} | if (data == 42) {} | Use ==. | Dart |
'value' + 75 | 'value' + 75.to_s | Convert int. | Ruby |
if (data = 73) | if (data == 73) | Use ==. | Scala |
cin >> y
cout << y; | cin >> y;
cout << y; | Add semicolon. | C++ |
values[19] | if (values.indices.contains(19)) values[19] | Check index. | Kotlin |
<a href='https://test.org' target='_blank'> | <a href='https://test.org' target='_blank' rel='noopener'> | Add rel for security. | HTML |
SELECT * FROM users WHRE age=44; | SELECT * FROM users WHERE age=44; | Fix WHERE. | SQL |
handle | handle() | Add parentheses. | Kotlin |
var x = 5; x = "hello" | var x = "hello" | Type mismatch. | Swift |
var x = 5; x = true | var x = 5; x = 10 | Type mismatch. | Kotlin |
if (bar = 2) {{}} | if (bar == 2) {{}} | Use ==. | Kotlin |
let index: i32 = "data"; | let index: &str = "data"; | Type mismatch. | Rust |
x <- 5; if (x > 3) print('large') | x <- 5; if (x > 3) print('large') | Correct. | R |
WHERE email = '47' | WHERE email = 47 | Don't quote integer. | SQL |
def baz(a):
return a + 1 | def baz(a):
return a + 1 | Correct. | Python |
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